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NGINX responding to keep alive after FIN

I'm trying to understand the issue where NGINX is not responding. After successful connection between port 60000 (NGNIX) and port 51874 (client), NGNIX is sending FIN to client. Client responds with Ack. After that client sends keep alive, NGNIX responds with Ack. For the second keep alive, NGNIX responds with RST. I don't understand what's happening. Can someone please explain.

NGINX responding to keep alive after FIN

I'm trying to understand the issue where NGINX is not responding. After successful connection between port 60000 (NGNIX) and port 51874 (client), NGNIX is sending FIN to client. Client responds with Ack. After that client sends keep alive, NGNIX responds with Ack. For the second keep alive, NGNIX responds with RST. I don't understand what's happening. Can someone please explain.

https://i.stack.imgur.com/jAS9O.jpg